I used this mod a lot on my old PC and it was really handy but when i downloaded it on my laptop and inserted it into my mods folder minecraft didn't start for some reason.
When I removed it from my mods folder minecraft started normally. This mod is really useful and any help would be appreciated.
I've tried both the beta and the stable releases and both of them don't work. I'm using Windows 10 and the minecraft version i downloaded it for was 1.8.9
Ok so i got the log from the files and I pasted into that website because the output from the launcher didn't let me paste it all at once (That was the problem earlier, not pastebin) and i had to scroll down every few lines and paste sections of it only to timeout after few minutes of doing this.
Anyways, it still says that there is a fatal error that is somewhat associated with replaymod (I linked that above too) but if you still need to go through the full log, here it is: https://paste.replaymod.com/ulebudihap
One of the coremods which you've installed is misbehaving by loading classes too early. This is not an issue with the ReplayMod (it just happens to be the first one to trip over it).
Try removing them until you find the one which causes it, then report it to them.
Based on the log, it's probably framesplus, mousesens or mousedelayfix, though it could really be any of them.